Are there a standard for generating a unique thing to send to the smart contract?

by js wang   Last Updated November 01, 2018 05:28 AM

Are there anything that is unique maybe combine with time, user address or something else, and send it to the smart contract, and the contract can know that it is indeed the unique thing that user doesn't not tell a lie?

Related Questions

Usage regarding for loop in solidity contract

Updated October 05, 2017 07:28 AM

Bad Instruction

Updated January 11, 2018 02:28 AM

state channel between smart contracts

Updated January 04, 2019 20:28 PM